null_blk: disk nullb1 created
================================================
WARNING: lock held when returning to user space!
syzkaller #0 Not tainted
------------------------------------------------
syz.0.452/6787 is leaving the kernel with locks still held!
locks held by syz.0.452/6787: 2, last CPU#0:
 #0: ffff88803652c190 (&q->q_usage_counter(io)#105){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
 #0: ffff88803652c190 (&q->q_usage_counter(io)#105){++++}-{0:0}, at: blk_throtl_init+0x27b/0x420 block/blk-throttle.c:1332
 #1: ffff88803652c1c8 (&q->q_usage_counter(queue)#88){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
 #1: ffff88803652c1c8 (&q->q_usage_counter(queue)#88){+.+.}-{0:0}, at: blk_throtl_init+0x27b/0x420 block/blk-throttle.c:1332